• Overview
  • Tech Specs
  • Videos
Computers with Allegro Type A USB 3.2 PCIe 4-Port Cards
SuperSpeed USB-A 5Gbps • USB Charge & Sync • Four Ports with up to 7.5W Power per Port

Speedy USB 3.2 Gen 1 Performance
Add the Speed of USB 3.2 Gen 1 Ports to Mac Pro, Windows, and Linux Computers with PCIe Slots; and Thunderbolt to PCIe Card Expansion Systems

Up to 10x the Performance of USB 2.0Upgrade to SuperSpeed Performance

Your computer’s USB 2.0 ports are perfectly adequate for connecting mice, keyboards, and printers, but if you need to connect external storage drives, USB 2.0 ports are underpowered in more ways than one—limiting data transfer speeds to around 25–30 MB/s, they can hardly be called “high performance”. Most drives available today include faster USB interfaces and offer significantly better performance than USB 2.0-equipped drives. Though you can connect them to your computer’s USB 2.0 ports, their performance would be reduced by as much as 85 percent! Don’t settle for slow performance—install a Sonnet Allegro Type-A USB 3.2 PCIe 4-Port(1) card to instantly add four SuperSpeed USB 5Gbps ports to your system to take full advantage of today’s drives’ performance capabilities.

PCIe Interface
The Allegro features a PCIe 2.0 bus interface to take advantage of your computer’s fast expansion card slots. This card installs easily into any PCI Express® (PCIe) slot that supports a full-height card, features hot-pluggable and hot-swappable device connection support with automatic device configuration, and works with all USB-IF compliant USB peripherals.

Compatible with 2023 Mac Pro

Key Features

Adds USB 3.2 Gen 1 Connectivity—Adds four USB-A 5Gbps ports to your Mac Pro®, Windows PC®, or Linux® computer with PCIe slots; or Thunderbolt™ to PCIe card expansion system

Speedy Performance—Transfers data up to 10x faster than over USB 2.0 connections

Super-Powered Ports—Supports USB 3.0 bus-powered hard drives, SSDs, DVDs & Blu-ray devices with up to 2.0A

Charging Ports—Supports USB 3.0 charging port handshake, and will simultaneously synch and charge iPads and other devices that support USB 3.0 charging at 1.5A per device

Broad USB Device Support & Compatibility—Supports storage, hubs, and other USB-IF compliant devices; compatible with USB 2.0 devices

Supports Hot-Swappable Device Connection—Plug in and disconnect peripherals without shutting off your computer

Add USB 3.2 Gen 1 to Thunderbolt Expansion Systems—Add four speedy USB-A 5Gbps ports to Thunderbolt to PCIe card expansion systems

Easy Installation—Quick and easy user installation into any available PCIe slot of your computer


USB 3.0 Cable IconPowerful Ports
Sonnet specially engineered the Allegro PCIe card to provide extra power through its ports without the need for you to connect an auxiliary power cable. Delivering up to 10W of power, this Sonnet solution supports USB 3.0 bus-powered hard drives, SSDs, DVDs & Blu-ray™ devices without the need to connect an additional AC power adapter. The Allegro also supports the USB 3.0 charging specification that enables you to simultaneously charge and sync your iPad®, iPhone®, or other device that supports USB 3.0 charging!

Add Four USB 3.0 Ports to Older Mac Computers with USB 2.0
Got an older Mac with USB 2.0 ports, no PCIe slots, and a Thunderbolt or Thunderbolt 2 port? The Allegro is a great way to add four USB-A 5Gbps ports for use in Sonnet’s Thunderbolt 2 and Thunderbolt 3 to PCIe card expansion systems, including Echo Express™ and xMac™ desktop and rackmount systems.

Mac Computers with Echo Express SE III

Perfect for the Extra Slot in Your Multi-Slot Thunderbolt System
Have a multi-slot Thunderbolt 2 or Thunderbolt 3 to PCIe card expansion system with an open slot? Installing an Allegro Type-A USB 3.2 PCIe 4-Port card is an excellent way to inexpensively add four SuperSpeed USB-A 5Gbps ports to your computer.

Echo Express SE IIIe
 Computer hardware shown in photos for illustration purposes; items sold separately.
See Tech Specs Tab for footnotes
Part No.  
USB3-4PM-E Allegro Type-A USB 3.2 PCIe 4-Port(1)
Warranty 2-year
Form Factor PCIe computer card
Bus Interface PCI Express 2.0 x1
Peripherals Supported Industry standard USB 3.2 Gen 1&2, 3.1 Gen 1&2, 3.0, 2.0, and 1.1
Bus Powered Peripherals Supported HDs, SSDs, DVDs, and Blu-ray devices up to 2A
Cables Supported USB 3.0 with Standard-A male connector, USB 2.0 with Standard-A male connector
Chipset Fresco Logic FL1100EX
RoHS Compliant Yes
Package Contents
  • Allegro USB 3.0 4-Port PCIe Computer Card
  • Documentation
USB Support  
Number of Ports 4 external
Standard Complies with OHCI (Open Host Controller Interface), EHCI (Enhanced Host Controller Interface), and xHCI (eXtensible Host Controller Interface) standards
UASP USB attached SCSI protocol supported under
OS X 10.8.5+ and Windows 8.1+
USB Charging USB Battery Charging 1.2 Compliant
(up to 7.5W per port)
Data Transfer Rate 5 Gbps
Number of Devices Supported Up to 31
Hot Plug Supports hot-pluggable and hot swappable device connection
Boot Support Thunderbolt 3 Macs


Specifications subject to change without notice.






Mac Compatibility

Mac Pro® 3,1(2),  4,1,  5,1, 7,1 (2019), or 14,8 (2023)

macOS 10.8.5+

macOS Sonoma compatible

Windows Compatibility

Computer with PCIe slots

Windows® 11, 10, 8, 7

Windows Server 2019, 2016, 2012, 2008 (64-bit editions)

Linux Compatibility

Computer with PCIe slots

Linux Kernel 5.4.0+

Ubuntu 20.04.1+

Thunderbolt Compatibility

Mac (Intel® or M1) or Windows PC via a Thunderbolt to PCIe Card Expansion System

macOS 10.8.5+

Windows 10

Technical Notes

  1. Product complies with USB 3.2 Gen 2 specification, which supersedes USB 3.1 Gen 2. Product package may still list USB 3.1 Gen 2.
  2. Compatible with Mac Pro 3,1 PCIe 1.1 slot


Mac OS logoWindows logoPCI Express LogoUSB 3.0 logoRoHS Compliant logo




Allegro Pro USB 3.0 4-Port PCIe Cards Product Overview (2:30 mins)

View More Sonnet VideosArrow